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Basically this P0101 diagnostic trouble code (DTC) means that there is a problem with the Mass Air Flow (MAF) sensor or circuit.
P0031 Oxygen sensor heater Control Circuit. The P0031 fault code is about an oxygen sensor heater circuit failure located in bank 1 sensor 1. (bank 1 is at exhaust manifold by the #1 cylinder head, bank 2 is on the 2nd cylinder head).On some engines, both exhaust manifolds could have one oxygen sensor on each side on both cylinder heads. 2).he P0031 fault code is about an oxygen sensor heater circuit failure located in bank 1 sensor 1. (bank 1 is at exhaust manifold by the #1 cylinder head, bank 2 is on the 2nd cylinder head). On some engines, both exhaust manifolds could have one oxygen sensor on each side on both cylinder heads.